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K isotopic fractionation in K-feldspar: Effects of mineral chemistry

  • Shanke Liu ORCID logo EMAIL logo , Wenjun Li , Benxun Su , Qiqi Pan , Meng Yuan and Patrick Asamoah Sakyi
Published/Copyright: September 9, 2024
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American Mineralogist
From the journal American Mineralogist Volume 109 Issue 9

Abstract

Controlling factors of potassium (K) isotopic fractionation in K-feldspar remain poorly constrained. In this study, we analyzed the K isotopic compositions of 11 K-feldspar samples from diverse lithological compositions. The degree of Al/Si order ranged from 0.22 to 0.94 (1.0 = completely ordered). Analyzed samples are mixtures of K-feldspar (>70 wt%) and coexisting albite. The relative contribution of K2O from the K-feldspar phase of the sample was over 98%, indicating that the K isotopic composition (δ41K) derives mainly from K-feldspar and hence reflects its behavior. The δ41K values of these samples range from –0.710 to –0.075‰, which are slightly correlated with the degree of Al/Si order. The correlations of δ41K with SiO2 and Al2O3 contents and the corresponding Al/Si mole ratios reveal that Al and Si play a significant role in the K isotopic behavior of K-feldspar. The correlations of δ41K with SiO2 and Al2O3 contents are attributed to the difference in K-O bond strengths. Compared to K-feldspar, the K content could be a better proxy for constraining the δ41K of plagioclase. Our results demonstrate that the δ41K of K-feldspar is dependent on its mineral chemistry, and its K isotopic composition may be insensitive to other factors, such as the source heterogeneity. The inference is further confirmed by comparing the δ41K values in this study with published δ41K values of K-feldspar from different sources.

Keywords: K isotopes; K-feldspar; Al/Si order; bond length; Al/Si mole ratio

Acknowledgments and funding

We thank Youlian Li for assistance in chemical purification and Lingli Zhou for critical comments and grammatical correction in improving the quality of this manuscript. Insightful comments from Associate Editor Paul Tomascak, Shi-Chun Huang, and two anonymous reviewers are gratefully acknowledged. This study was financially supported by Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (2019QZKK0802), the Beijing Natural Science Foundation (8202048), and the Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences (Grant No. TEC 202103).

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Received: 2023-03-20
Accepted: 2023-11-23
Published Online: 2024-09-09
Published in Print: 2024-09-25

© 2024 by Mineralogical Society of America

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  11. First application of scintillator-based photon-counting computed tomography to rock samples: Preliminary results and prospects
  12. GCDkit.Mineral: A customizable, platform-independent R-language environment for recalculation, plotting, and classification of electron probe microanalyses of common rock-forming minerals
  13. Apatite as an archive of pegmatite-forming processes: An example from the Berry-Havey pegmatite (Maine, U.S.A.)
  14. Re-examination of vesbine in vanadate-rich sublimate-related associations of Vesuvius (Italy): Mineralogical features and origin
  15. Temperature and compositional dependences of H2O solubility in majorite
  16. Raman spectroscopy of the ilmenite–geikielite solid solution
https://doi.org/10.2138/am-2023-9006
Keywords for this article
K isotopes; K-feldspar; Al/Si order; bond length; Al/Si mole ratio

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  3. First widespread occurrence of rare phosphate chladniite in a meteorite, winonaite Graves Nunataks (GRA) 12510: Implications for phosphide–phosphate redox buffered genesis in meteorites
  4. K isotopic fractionation in K-feldspar: Effects of mineral chemistry
  5. Jarosite formation in Permian-Triassic strata at Xiakou (South China): Implications for jarosite precipitation from H2S upwelling on Mars
  6. The effect of A-site cations on charge-carrier mobility in Fe-rich amphiboles
  7. Calorimetry and structural analysis of uranyl sulfates with rare topologies
  8. Biological control of ultra-skeleton mineralization in coral
  9. Systematic study of high field strength elements during liquid immiscibility between carbonatitic melt and silicate melt
  10. Clustering and interfacial segregation of radiogenic Pb in a mineral host-inclusion system: Tracing two-stage Pb and trace element mobility in monazite inclusions in rutile
  11. First application of scintillator-based photon-counting computed tomography to rock samples: Preliminary results and prospects
  12. GCDkit.Mineral: A customizable, platform-independent R-language environment for recalculation, plotting, and classification of electron probe microanalyses of common rock-forming minerals
  13. Apatite as an archive of pegmatite-forming processes: An example from the Berry-Havey pegmatite (Maine, U.S.A.)
  14. Re-examination of vesbine in vanadate-rich sublimate-related associations of Vesuvius (Italy): Mineralogical features and origin
  15. Temperature and compositional dependences of H2O solubility in majorite
  16. Raman spectroscopy of the ilmenite–geikielite solid solution
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